2684439657 has 8 divisors (see below), whose sum is σ = 3976947680. Its totient is φ = 1789626420.

The previous prime is 2684439631. The next prime is 2684439673. The reversal of 2684439657 is 7569344862.

2684439657 is a `hidden beast` number, since 2 + 68 + 443 + 96 + 57 = 666.

It is not a de Polignac number, because 2684439657 - 2¹² = 2684435561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2684439257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49711819 + ... + 49711872.

It is an arithmetic number, because the mean of its divisors is an integer number (497118460).

Almost surely, 2^2684439657 is an apocalyptic number.

2684439657 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2684439657 is a deficient number, since it is larger than the sum of its proper divisors (1292508023).

2684439657 is an equidigital number, since it uses as much as digits as its factorization.

2684439657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99423700 (or 99423694 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The square root of 2684439657 is about 51811.5784067616. The cubic root of 2684439657 is about 1389.7965054135.

The spelling of 2684439657 in words is "two billion, six hundred eighty-four million, four hundred thirty-nine thousand, six hundred fifty-seven".